These guys have some fascinating structure on the face, but they are very difficult to shoot in the extreme closeups that I like, because the structure uses up too much DOF, and something important ends up blurry. Every once in awhile, I get it from a decent angle though. I have mixed feelings about the second horn in back lining up so well with the front one, though.
Controlled situation.
Are these also referred to at times, as being "Horned Vipers?" 
As for the alignment of the two horns being so close, I would not have noticed, had you not pointed them out but they look okay to me. 
